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By Marilynn Marchione The Associated Press

Chinese authorities appear to have confirmed a scientist’s unpublished claim that he helped make the world’s first gene-edited babies and that a second pregnancy is underway, and say he could face consequences for his work.

CHICAGO — Fish oil, vitamin D, novel drugs, new cholesterol guidelines: News from an American Heart Association conference over the weekend reveals a lot about what works and what does not for preventing heart attacks and other problems.

PHOENIX — Early, partial results from a historic gene editing study give encouraging signs that the treatment may be safe and having at least some of its hoped-for effect, but it’s too soon to know whether it ultimately will succeed.

Taking a low-dose aspirin every day has long been known to cut the chances of another heart attack, stroke or other heart problem in people who already have had one, but the risks don’t outweigh the benefits for most other folks, major new research finds.

Everyone makes mistakes, but when scientists do, the remedy goes far beyond saying you’re sorry. Two fresh examples show how some journals and universities react when the need arises to set the record straight.

CHICAGO — Most women with the most common form of early-stage breast cancer can safely skip chemotherapy without hurting their chances of beating the disease, doctors are reporting from a landmark study that used genetic testing to gauge each patient’s risk.

CHICAGO — For the first time, a treatment that boosts the immune system greatly improved survival in people newly diagnosed with the most common form of lung cancer. It’s the biggest win so far for immunotherapy, which has had much of its success until now in less common cancers.

There may be a critical window for overweight kids to get to a healthy level. Those who shed their extra pounds by age 13 had the same risk of developing diabetes in adulthood as others who had never weighed too much, a large study of Danish men found.